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scsi: target: Add tmr_notify backend function

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Target core is modified to call an optional backend callback function if a
TMR is received or commands are aborted implicitly after a PR command was
received.  The backend function takes as parameters the se_dev, the type of
the TMR, and the list of aborted commands.  If no commands were aborted, an
empty list is supplied.

Link: https://lore.kernel.org/r/20200726153510.13077-3-bstroesser@ts.fujitsu.com
Reviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Bodo Stroesser <bstroesser@ts.fujitsu.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bodo Stroesser 2020-07-26 17:35:04 +02:00 committed by Martin K. Petersen
parent f5e2714ad1
commit 2e45a1a9c7
4 changed files with 19 additions and 1 deletions
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16
drivers/target/target_core_tmr.c
View File

@ -116,6 +116,7 @@ void core_tmr_abort_task(
struct se_tmr_req *tmr,
struct se_session *se_sess)
{
LIST_HEAD(aborted_list);
struct se_cmd *se_cmd, *next;
unsigned long flags;
bool rc;
@ -144,7 +145,7 @@ void core_tmr_abort_task(
if (!rc)
continue;
list_del_init(&se_cmd->state_list);
list_move_tail(&se_cmd->state_list, &aborted_list);
se_cmd->state_active = false;
spin_unlock_irqrestore(&dev->execute_task_lock, flags);
@ -157,6 +158,11 @@ void core_tmr_abort_task(
WARN_ON_ONCE(transport_lookup_tmr_lun(tmr->task_cmd) <
0);
if (dev->transport->tmr_notify)
dev->transport->tmr_notify(dev, TMR_ABORT_TASK,
&aborted_list);
list_del_init(&se_cmd->state_list);
target_put_cmd_and_wait(se_cmd);
printk("ABORT_TASK: Sending TMR_FUNCTION_COMPLETE for"
@ -167,6 +173,9 @@ void core_tmr_abort_task(
}
spin_unlock_irqrestore(&dev->execute_task_lock, flags);
if (dev->transport->tmr_notify)
dev->transport->tmr_notify(dev, TMR_ABORT_TASK, &aborted_list);
printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %lld\n",
tmr->ref_task_tag);
tmr->response = TMR_TASK_DOES_NOT_EXIST;
@ -318,6 +327,11 @@ static void core_tmr_drain_state_list(
}
spin_unlock_irqrestore(&dev->execute_task_lock, flags);
if (dev->transport->tmr_notify)
dev->transport->tmr_notify(dev, preempt_and_abort_list ?
TMR_LUN_RESET_PRO : TMR_LUN_RESET,
&drain_task_list);
while (!list_empty(&drain_task_list)) {
cmd = list_entry(drain_task_list.next, struct se_cmd, state_list);
list_del_init(&cmd->state_list);

1
drivers/target/target_core_transport.c
View File

@ -2946,6 +2946,7 @@ static const char *target_tmf_name(enum tcm_tmreq_table tmf)
case TMR_LUN_RESET: return "LUN_RESET";
case TMR_TARGET_WARM_RESET: return "TARGET_WARM_RESET";
case TMR_TARGET_COLD_RESET: return "TARGET_COLD_RESET";
case TMR_LUN_RESET_PRO: return "LUN_RESET_PRO";
case TMR_UNKNOWN: break;
}
return "(?)";

2
include/target/target_core_backend.h
View File

@ -40,6 +40,8 @@ struct target_backend_ops {
ssize_t (*show_configfs_dev_params)(struct se_device *, char *);
sense_reason_t (*parse_cdb)(struct se_cmd *cmd);
void (*tmr_notify)(struct se_device *se_dev, enum tcm_tmreq_table,
struct list_head *aborted_cmds);
u32 (*get_device_type)(struct se_device *);
sector_t (*get_blocks)(struct se_device *);
sector_t (*get_alignment_offset_lbas)(struct se_device *);

1
include/target/target_core_base.h
View File

@ -207,6 +207,7 @@ enum tcm_tmreq_table {
TMR_LUN_RESET = 5,
TMR_TARGET_WARM_RESET = 6,
TMR_TARGET_COLD_RESET = 7,
TMR_LUN_RESET_PRO = 0x80,
TMR_UNKNOWN = 0xff,
};